I'll be frank, I'm seeing a little lag but not a ton. Opening apps isn't like immediate anymore, it's about 1 or 2 seconds to fully load it. about the same as a 4S. Sbsettings says I have 555mb free ram so that's definitely an improvement or what I was seeing on my 4 (200 or below) and I'm running a ton of tweaks, along with ayecon.

I've always been "paranoid" and noticed lag on my iPhone 5. Especially SOMETIMES, OCASSIONALY when exiting out of Safari or any app , It kinda "takes against", I dont know how to say it - it's very hard to explain but theres a weird animation, like lag. Like it's having a hard time exiting from it.

Also theres a slightly added milliseconds when you enter homescreen from lockscreen after I got intelliscreenx.

I did try installing ColorKeyboard but I am noticing some lag when I begin typing (when it moves from uppercase to lowercase on the first letter). Disabled for now but not sure if I will remove it completely or not.

Also may have had some keyboard lag at the same instance with Showcase but I was having another issue with the keyboard disappearing which forced me to remove this. I really hope the developer can get this figured out though, I really love this tweak.